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Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films
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30. The Fe-rich composition of Fe:Co = 11:1 was used for the sample C because the magnitude of the magnetic field used in this study is too small to saturate the magnetization of CFO films with the composition of Fe:Co = 3:1 grown on MgO(001) along the hard axis ().
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, K. Uchida
, S. Daimon
, Z. Qiu
, Y. Shiomi
, and E. Saitoh
33. As demonstrated in Ref. 32, the suppression of the LSSE voltage by magnetic fields disappears when the thickness of the ferrimagnetic layer is thinner than thermalization lengths of low-frequency magnons.
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The longitudinal spin-Seebeck effect (LSSE) has been investigated in cobalt ferrite (CFO), an exceptionally hard magnetic spinel ferrite. A bilayer of a polycrystalline Pt and an epitaxially-strained CFO(110) exhibiting an in-plane uniaxial anisotropy was prepared by reactive rf sputtering technique. Thermally generated spin voltage in the CFO layer was measured via the inverse spin-Hall effect in the Pt layer. External-magnetic-field (H) dependence of the LSSE voltage (V
LSSE) in the Pt/CFO(110) sample with H ∥  was found to exhibit a hysteresis loop with a high squareness ratio and high coercivity, while that with
shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of V
LSSE has a linear relationship with the temperature difference (ΔT), giving the relatively large V
LSSE /ΔT of about 3 μV/K for CFO(110) which was kept even at zero external field.
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